44 JOURNAL, BOMBAY NATURAL MIST. SOCIETY, Vol. XXVII, 



A comparison of the Dicotyledons with the Monocotyledons shows the 

 great poverty of the latter, whether we consider the orders, genera, or 

 species : 



Or- 

 ders. 



Genera. 



Indige- 



Intro- 

 duced 



Total of 

 Genera. 



Species. 



Indi- 

 o-enous. 



Intro- 

 duced. 



Total of 

 Species. 



Dicotyledons 



Monocotyle- 

 dons 



63 



187 



39 



41 



228 



44 



385 



105 



(52 



397 



110 



If we take only the indigenous plants into account we find that the 

 Dicotyledons make up 76"13 per cent., and the Monocotyledons 23'86 per 

 cent, of the total, in other words, the ratio of Monocotyledons to Dicoty- 

 ledons is 1 : 3'9. 



The ratio of orders to genera and species is 1 : 3'9 : 7*3. 



The proportion of genera to species is striking. In the whole of British 

 India it is 1 : 7, in the Bombay Presidency (including Sind) it is 1: 2-6, 

 whilst in the Eajputana desert it is 1 : 1"99. 



For the number of genera belonging to each order we refer to the 

 following diagram which does not require any explanation : — 



